21
P/N 42-9470 11/07 Copyright 2007 Mestek, Inc.
Cast iron condensing boiler
Cast iron condensing boiler
— Installation and operation manual
Wiring single boiler
(continued)
7
Figure 19
Circulator wiring terminal strip (see Figure 15
for location) — Also see the wiring summary
illustrations on the next pages)
Figure 17
Wiring the boiler circulator using a circulator
relay (required for motors over 1/4 hp)
Figure 18
Wiring the boiler circulator using a relay or
starter (required for motors over 1/4 hp)
Circulator wiring
Postpurge circulator
The circulator shipped installed with the boiler
cannot be used for system circulation.
It must be used
as supplied from the factory. It circulates water aft er the boiler
stops fi ring to prevent potential damage from heat pocketing
in the top of the heat exchanger.
Th e postpurge circulator is factory-piped and pre-wired. Do
not change the usage, the wiring, the location or the piping.
Boiler circulator
See section 5 of this manual for circulator piping.
Figure 19 shows wiring of the Boiler circulator (or boiler/
system circulator) to the terminal strip of the
200i
electrical
connection board.
DO NOT directly connect a circulator with a motor larger
than 1/4 hp. For larger motors, install a circulator relay or
motor contactor . Figures 17 and 18 show the correct ways
to install the boiler circulator using a relay or motor starter.
•
•
•
•
•